Some of the snack foods we ate earlier were not as diverse as they are now. Corn was the staple food of people’s lives in the past. Now corn is sent to food processing plants to be processed into various snacks. With the development of society, corn flakes equipment has been created, and many flavor

1. Distinguish from packagingGenerally, there are different technical standards for the three kinds of respirators, namely, disposable medical respirator (YY / t0969-2013), medical surgical mask (yy0469-2011) and medical protective mask (gb19038-2010). You can judge which type of mask the product be